2013年职称英语备考每日练习理工类18_第2页

　　词汇:
　　backpack/5bAkpAk/n．背包 watt/wCt /n．瓦（特）www.examzz.com
　　receiver/ri5si:vE(r)/n．接收机 gait/eit/n．步态，步法
　　night-visiongoggle 夜视镜 oscillation/7Csi5leiFEn/n．摆动
　　spring/spriN /n．弹簧 commercialize/kE5mE:FElaiz/v．商业化
　　vertical/5vE:tikEl /adj．垂直的 mountaineer/7maunti5niE(r)/n．登山运动员
　　rotary/5rEutEri /adj．旋转的
　　练习：
　　1． Backpacks are convenient because
　　A they can be verylarge．
　　B they can hold as many things as you want to carry．
　　C your handsare freed to do other things．
　　D you do not have to carry things withyou．
　　2． What is the most important feature of the backpack invented byLawrence C．Rome
　　and his colleagues?
　　A It produces electricity forelectronic devices while the wearer walks．
　　B It can be used as cellphones，GPS in the military actions or field studies．
　　C It is small andconvenient．
　　D It is light and easy to carry．
　　3． The word "springs" inParagraph 3 means
　　A a small stream of water flowing naturally from theearth．
　　B the season of the year，occurring between winter and summer．
　　C the act or an instance of jumping or leaping．
　　D a length of metal woundaround，which returns to its original shape after
　　being pushed．
　　4． According to Paragraph 4，what does Rome plan to do?
　　A To make the backpackmore comfortable for the wearer．
　　B To put the backpack on the market．
　　C To test the advantage of the backpack．
　　D To promote the backpack in anewspaper or on television．
　　5． What is implied in “if you do get oneeventually，just make sure to took both
　　ways before crossing the street!”?
　　A You will be too excited to watch the traffic．
　　B Enjoyingelectronic devices while walking may invite traffic accidents．
　　C It is notpossible for you to get such a backpack．
　　D It is wise of you to have such abackpack．
　　答案与题解：
　　1．C第一段告诉我们，因为背包可以装许多东西，所以可以将双手解放出来做其他事情：tofree your hands to do other things。